将1.5%石墨烯/石蜡复合相变材料填充到内管形状不同、换热面积相同的套管换热器内,采用数值模拟的方法分析内管形状对石蜡类复合相变材料蓄放热性能的影响。结果表明,异型管能有效提升石蜡复合相变材料的熔化及凝固速率,滴型管外石蜡复合相变材料的熔化速率比椭圆管及圆管分别提高53%、62%,滴型管外石蜡复合相变材料的凝固速率比椭圆管及圆管分别提高6.7%、9.8%。基于场协同原理分析异型管的强化石蜡类复合相变材料的传热机理,由于滴型管能使石蜡类复合相变材料在相变过程中温度场与速度场协同性更高,因此能更有效地提升其相变速率。
Abstract
The influence of inner tube shape on the heat storage and release performance of 1.5% graphene / paraffin composite phase change material which is filled into the casing heat exchangers with different inner tube shapes and the same heat exchange area is analyzed by numerical simulation. The results show that the melting and solidification rate of the paraffin composite phase change material can be effectively improved by the special-shaped tube. The melting rate of paraffin composite materials outside the drop tube is 53% and 62% higher than that outside the elliptical tube and circular tube respectively, and the solidification rate of paraffin composite materials outside the drop tube is 6.7% and 9.8% higher than that outside the elliptical tube and circular tube respectively. Based on the field synergy principle, the mechanism of heat transfer enhancement of special-shaped tube in the process of the paraffin composite phase change materials phase transition is analyzed. The phase change rate of the paraffin composite phase change materials can be improved more effectively because the drop tube can make the temperature field and velocity field of composite phase change materials more consistent in the process of phase change.
关键词
相变储能 /
石蜡 /
数值模拟 /
场协同 /
异型管 /
太阳能利用
Key words
phase change /
energy storage /
paraffin wax /
numerical simulation /
field synergy /
special-shaped tube /
solar energy utilization
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] HABIB N A, ALI A J, CHAICHAN M T, et al.Carbon nanotubes/paraffin wax nanocomposite for improving the performance of a solar air heating system[J]. Thermal science and engineering progress, 2021, 23: 100877.
[2] CHIBANI A, MEROUANI S.Acceleration of heat transfer and melting rate of a phase change material by nanoparticles addition at low concentrations[J]. International journal of thermophysics, 2021, 42(5),DOI: 10.1007/s10765-021-02822-z.
[3] DIXIT P, VENNAPUSA J R, PATVAT S, et al.Thermal buffering performance of a propyl palmitate/expanded perlite-based form-stable composite: experiment and numerical modeling in a building model[J]. Energy and fuels, 2021, 35(3): 2704-2716.
[4] WU T T, HU Y, RONG H Q, et al.SEBS-based composite phase change material with thermal shape memory for thermal management applications[J]. Energy, 2021, 221: 119900.
[5] 李椿, 王志华, 王建春, 等. 壳管式相变储能换热器性能研究与场协同效应分析[J]. 太阳能学报, 2020, 41(3): 226-233.
LI C, WANG Z H, WANG J C, et al.Study on performance and field synergistic effect of shell and tube phase change heat exchanger[J]. Acta energiae solarica sinica, 2020, 41(3): 226-233.
[6] ESAPOUR M, HAMZEHNEZHAD A, DARZI A A R, et al. Melting and solidification of PCM embedded in porous metal foam in horizontal multi-tube heat storage system[J]. Energy conversion and management, 2018, 171: 398-410.
[7] LIU X D, HUANG Y P, ZHANG X, et al.Investigation on charging enhancement of a latent thermal energy storage device with uneven tree-like fins[J]. Applied thermal engineering, 2020, 179: 115749.
[8] CHEN C Q, DIAO Y H, ZHAO Y H, et al.Optimization of phase change thermal storage units/devices with multichannel flat tubes: a theoretical study[J]. Renewable energy, 2021, 167: 700-717.
[9] 李慧君, 李东, 王亚库, 等. 异型管曲率对气液膜分布及凝结换热特性的影响析[J]. 化工学报, 2021, 72(5): 2560-2569.
LI H J, LI D, WANG Y K, et al.Influence of curvature on gas-liquid film distribution and heat transfer characteristics of condensation[J]. Journal of chemical industry and engineering, 2021, 72(5): 2560-2569.
[10] 刘妮, 崔强, 赖晓玲. 椭圆管翅式换热器空气侧传热和流动特性的数值模拟[J]. 热能动力工程, 2020, 35(6): 136-142.
LIU N, CUI Q, LAI X L.Numerical simulation of heat transfer and flow characteristics on the air side of an elliptical tub-fin heat exchanger[J]. Engineering for thermal energy and power, 2020, 35(6): 136-142.
[11] 文夏楠, 翟慧星, 王随林. 含尘烟气横掠交错排列椭圆与圆管束数值模拟[J]. 中国科技论文, 2021, 16(2): 223-228.
WEN X N, ZHAI H X, WANG S L.Numerical simulation of cross arrangement of elliptic and circular tube bundle with dust and smoke[J]. China science paper, 2021, 16(2): 223-228.
[12] LI X, LI W, GUO Y L.Experimental study on phase change heat storage and release of paraffin wax outside the round tube[J]. Journal of engineering thermophysics, 2009(7): 145-147.
[13] CALIANO M, BIANCO N, GRADITII G, et al.Analysis of a phase change material-based unit and of an aluminum foam/phase change material composite-based unit for cold thermal energy storage by numerical simulation[J]. Applied energy, 2019, 256: 113921.
[14] GUO Z Y, WEI S, CHENG X G.Heat exchanger enhancement field synergy principle[J]. Science bulletin, 2003, 48(22): 2324-2327.
PDF(2070 KB)
